Bathtub Reverb Accu-Bell Effector Upgrade Project

S

SamuelG

Member
This is my project thread to invite comments / mockery *cough* shared laughter or any input readers might deem worth while :cool:
Here is my draft graphic of the Effector against the Reverb
2025-06 AB Effector.png .png.png
I have yet to label the three way switch at top left. It will be up-Reverb, mid-Delay, down-Chorus.
The labelled switch second top left, is the voicing switch similar to the Mod I built from TassiVicking's idea.
There will also be another momentary footswitch in the bottom left corner for the tap-tempo.

I have based the circuit from the ABE data-sheet example and borrowed ideas from the GT-Stasis Lead Build. Schematic attached.

Thoughts? Ideas for a better name?
 

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I would just try to wire the Effector module to the same place that the BTDR2 module was connected to, and hope I don't see any magic smoke.
I would change the L7805 to a L7806 and use that for powering the ABE, just connect the In, out1+, out2+, +6V and ground at the terminals for the BTDR2 module.

I would hope that the circuit would be ok for an ABT since it works with the BTDR2 module, you could always run some tests first if you are worried.
I would not add any opamps if it really don't need any.

Place the Tap LED right above the tap switch or to the right of it, unless you want to see it when you tap the switch with your foot.

I might have to try this myself so I get another chorus pedal, one with tubes in it.
The Bath Tub Reverb PCB is the only one I haven't ordered because there is none in stock, all the rest I have or they are on the way right now.
 
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I had considered this.
In the end I decided to use this build as a learning experience. I’ve never used op amps before and am enjoying the learning. :)

I know it's expensive, but if I learn how to use the OPA2134 dual op-amp it'll open up more design possibilities for me.

My current inquiry is about signal inversion. I’m trying to find out if the differential output is in phase with the input. I don't have a dual input oscilloscope to make a direct test.

I'm playing with the idea (not entirely seriously) of integrating the tap LED in the UV design using basic 1mm light fibres (red dots).
2025-06 AB Effector 3.png
 
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